MIC33263/4 4MHz, 2A Buck Regulator with Integrated Inductor and HyperLight Load General Description Features The MIC33263/4 is a highly-efficient synchronous buck Integrated MOSFETs, inductor regulator with an integrated inductor which provides the 100% duty cycle optimal trade-off between footprint and efficiency. The 4MHz PWM operation in continuous mode MIC33263/4 operates at 4MHz switching frequency and 2A output current provides up to 2A output current. In addition, the 100% duty cycle and HyperLight Load (HLL) mode-of-operation Low output voltage ripple delivers very-high efficiency at light loads and ultra-fast 85% typical efficiency at 1mA and up to 93% peak transient response which makes the MIC33263/4 perfectly efficiency suited for any space-constrained application and great Ultra-fast transient response alternative for low dropout regulators. An additional benefit Advanced copper lead frame design provides superior of this proprietary architecture is very low output ripple thermal performance voltage throughout the entire load range with the use of Thermal-shutdown and current-limit protection small output capacitors. Low-radiated emission (EMI) per EN55022, class B The MIC33263/4 provides small compact total solution Adjustable output voltage 0.7V to 5V size of 4.6mm 7mm with very few tiny external components. Configurable soft-start with pre-bias start-up capability Auto discharge of 180 (MIC33264 only) At higher loads, the MIC33263/4 provides a constant switching frequency around 4MHz while achieving peak Low profile 2.5mm 3.0mm 1.9mm QFN packages efficiencies up to 93%. It also includes under-voltage 0.1A shutdown current lockout to ensure proper operation under power-sag 33A quiescent current conditions, internal soft-start to reduce inrush current, foldback current limit, power good (PG) indicator, and Applications thermal shutdown. The MIC33263/4 is available in a 20-pin 5V point-of-load (POL) 2.5mm 3.0mm 1.9mm QFN package with an operating junction temperature range from 40C to +125C. Low voltage distributed power systems Space-constrained applications Datasheets and support documentation are available on Micrels website at: www.micrel.com. Portable devices SSD storage systems Digital cameras Typical Application Efficiency vs. Output Current 100 90 80 70 V = 1.2V V = 1.8V OUT OUT V = 2.5V OUT 60 50 40 30 20 VIN = 3.3V 10 0 10 100 1000 OUTPUT CURRENT (mA) HyperLight Load is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC33263/4 Ordering Information (1, 2) Part Number Output Voltage Auto Discharge Junction Temperature Range Package MIC33263YGK ADJ No 20-Pin 2.5mm 3mm QFN 40 C to +125 C MIC33264YGK ADJ Yes 40 C to +125 C 20-Pin 2.5mm 3mm QFN Note: 1. QFN is a GREEN, RoHS-compliant package. Mold compound is Halogen Free. 2. Pb-free. Lead finish is matte tin. Pin Configuration 2.5mm 3mm QFN (GK) (Top View) Pin Description Pin Number Pin Name Pin Function 1, 20 PVIN Power Input Voltage: Connect a capacitor to PGND to decouple the noise. 2, 8, 9 PGND Power Ground. Switch (Output): Internal power MOSFET output switches. Disable pull down 180 Ohms 3, 4, 5, 6, 7 SW (MIC33264 only). 10, 11, 12, 13 VOUT Inductor Output. Connect a capacitor to PGND to filter the switcher output voltage. Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT, 14 AGND PGND) for best operation. 15 AVIN Analog Input Voltage: Connect a capacitor to ground to decouple the noise. 16 SS Soft-Start: Place a capacitor from SS pin to ground to program the soft-start time Power Good: Open Drain output for the power good indicator. Place a resistor between this pin 17 PG and a voltage source to detect a power good condition. 18 FB Feedback: Connect a resistor divider from the output to ground to set the output voltage. Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device. 19 EN Do not leave floating. Revision 2.1 January 28, 2015 2